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<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
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    <title>Document</title>
</head>

<body>
    <script>
        //    把1-100之间所有能够被3和7同时整除的数找出来，计算累加和
        let sum = 0;
        // console.log(sum);

        for (let i = 1; i <= 100; i++) {
            if (i % 3 == 0) {
                sum = sum + i;
            }
            if (i % 7 == 0) {
                sum = sum + i;
            }
        }
        console.log(sum);
    </script>
</body>

</html>